Where does “pseudosibling” come from?

pseudosibling (English) comes from English pseudo, from English pseudo-, from Ancient Greek ψευδής, from Ancient Greek -ής, from Proto-Indo-European -ēs, from Proto-Indo-European -ess, from Proto-Indo-European -os — Creates action nouns or result nouns from verbs;...

pseudosibling (English): One who is not a sibling but has a relationship...

Definitions

  1. One who is not a sibling but has a relationship...

Ancestry of “pseudosibling”, step by step

pseudosibling traces back through two separate lines of ancestry.

via English pseudo

StepLanguageWordMeaning
1EnglishpseudoAn intellectually pretentious person; a...
2Englishpseudo-False, not genuine, fake
3Ancient Greekψευδήςlying, false, untrue; deceived, beguiled
4Ancient Greek-ήςadjective suffix
5Proto-Indo-European-ēsPrimarily forms adjectival bahuvrīhi compounds
6Proto-Indo-European-ess
7Proto-Indo-European-osCreates action nouns or result nouns from verbs;...

via English sibling

StepLanguageWordMeaning
1EnglishsiblingA person who shares a parent; one's brother or...
2Old Englishsiblingrelative, kinsman
3Old English-lingadverbial suffix denoting direction, state or...
4Old Englishlanglong; lasting; old, ancient; advanced
5Proto-West Germaniclanglong
6Proto-Germaniclangazlong
7Proto-Indo-Europeandlongʰoslong
Every word from Proto-Indo-European -osEvery word from Ancient Greek -ήςEvery word from English pseudo-